1 // Copyright 2014 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 //go:build (amd64 || amd64p32) && gc
6
7 #include "textflag.h"
8
9 TEXT ·RewindAndSetgid(SB),NOSPLIT,$0-0
10 // Rewind stack pointer so anything that happens on the stack
11 // will clobber the test pattern created by the caller
12 ADDQ $(1024 * 8), SP
13
14 // Ask signaller to setgid
15 MOVL $1, ·Baton(SB)
16
17 // Wait for setgid completion
18 loop:
19 PAUSE
20 MOVL ·Baton(SB), AX
21 CMPL AX, $0
22 JNE loop
23
24 // Restore stack
25 SUBQ $(1024 * 8), SP
26 RET
27
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